<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>FlowGL - ECHARTS-GL</title>
    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
    <meta name="apple-mobile-web-app-capable" content="yes"> <!-- Fullscreen Landscape on iOS -->
    <link rel="stylesheet" href="./common.css">
</head>
<body>
<div id="main"></div>
<script src="../node_modules/echarts/dist/echarts.js"></script>
<script src="../node_modules/echarts/dist/extension/bmap.js"></script>
<script src="http://api.map.baidu.com/api?v=2.0&ak=ZUONbpqGBsYGXNIYHicvbAbM"></script>
<script src="../dist/echarts-gl.js"></script>
<script src="lib/jquery.min.js"></script>
<script src="js/commonUI.js"></script>
<script>
    var chart = echarts.init(document.getElementById('main'));

    $.getJSON('data/winds.json', function (windData) {
        var data = [];
        var p = 0;
        var maxMag = 0;
        var minMag = Infinity;
        for (var j = 0; j < windData.ny; j++) {
            for (var i = 0; i <= windData.nx; i++) {
                // Continuous data.
                var p = (i % windData.nx) + j * windData.nx;
                var vx = windData.data[p][0];
                var vy = windData.data[p][1];
                var mag = Math.sqrt(vx * vx + vy * vy);
                // 数据是一个一维数组
                // [ [经度, 维度，向量经度方向的值，向量维度方向的值] ]
                data.push([
                    i / windData.nx * 360 - 180,
                    j / windData.ny * 180 - 90,
                    vx,
                    vy,
                    mag
                ]);
                maxMag = Math.max(mag, maxMag);
                minMag = Math.min(mag, minMag);
            }
        }
        chart.setOption(option = {
            visualMap: {
                left: 'right',
                min: minMag,
                max: maxMag,
                dimension: 4,
                inRange: {
                    // color: ['green', 'yellow', 'red']
                    color: ['#313695', '#4575b4', '#74add1', '#abd9e9', '#e0f3f8', '#ffffbf', '#fee090', '#fdae61', '#f46d43', '#d73027', '#a50026']
                },
                realtime: false,
                calculable: true,
                textStyle: {
                    color: '#fff'
                }
            },
            bmap: {
                center: [0, 0],
                zoom: 1,
                roam: true,
                mapStyle: {
                    'styleJson': [
                        {
                            'featureType': 'water',
                            'elementType': 'all',
                            'stylers': {
                                'color': '#031628'
                            }
                        },
                        {
                            'featureType': 'land',
                            'elementType': 'geometry',
                            'stylers': {
                                'color': '#000102'
                            }
                        },
                        {
                            'featureType': 'highway',
                            'elementType': 'all',
                            'stylers': {
                                'visibility': 'off'
                            }
                        },
                        {
                            'featureType': 'arterial',
                            'elementType': 'geometry.fill',
                            'stylers': {
                                'color': '#000000'
                            }
                        },
                        {
                            'featureType': 'arterial',
                            'elementType': 'geometry.stroke',
                            'stylers': {
                                'color': '#0b3d51'
                            }
                        },
                        {
                            'featureType': 'local',
                            'elementType': 'geometry',
                            'stylers': {
                                'color': '#000000'
                            }
                        },
                        {
                            'featureType': 'railway',
                            'elementType': 'geometry.fill',
                            'stylers': {
                                'color': '#000000'
                            }
                        },
                        {
                            'featureType': 'railway',
                            'elementType': 'geometry.stroke',
                            'stylers': {
                                'color': '#08304b'
                            }
                        },
                        {
                            'featureType': 'subway',
                            'elementType': 'geometry',
                            'stylers': {
                                'lightness': -70
                            }
                        },
                        {
                            'featureType': 'building',
                            'elementType': 'geometry.fill',
                            'stylers': {
                                'color': '#000000'
                            }
                        },
                        {
                            'featureType': 'all',
                            'elementType': 'labels.text.fill',
                            'stylers': {
                                'color': '#857f7f'
                            }
                        },
                        {
                            'featureType': 'all',
                            'elementType': 'labels.text.stroke',
                            'stylers': {
                                'color': '#000000'
                            }
                        },
                        {
                            'featureType': 'building',
                            'elementType': 'geometry',
                            'stylers': {
                                'color': '#022338'
                            }
                        },
                        {
                            'featureType': 'green',
                            'elementType': 'geometry',
                            'stylers': {
                                'color': '#062032'
                            }
                        },
                        {
                            'featureType': 'boundary',
                            'elementType': 'all',
                            'stylers': {
                                'color': '#465b6c'
                            }
                        },
                        {
                            'featureType': 'manmade',
                            'elementType': 'all',
                            'stylers': {
                                'color': '#022338'
                            }
                        },
                        {
                            'featureType': 'label',
                            'elementType': 'all',
                            'stylers': {
                                'visibility': 'off'
                            }
                        }
                    ]
                }
            },
            series: [{
                type: 'flowGL',
                coordinateSystem: 'bmap',
                data: data,
                supersampling: 4,
                particleType: 'line',
                particleDensity: 128,
                particleSpeed: 1,
                // gridWidth: windData.nx,
                // gridHeight: windData.ny,
                itemStyle: {
                    opacity: 0.7
                }
            }]
        });
    });

    // setTimeout(function () {
    //     chart.dispose();
    // }, 5000);
</script>
</body>
</html>
